how to create metric map and metric buildings/vehicles/etc in blender?
How to scale units from blender to unity?

Go into blender
Scene > unit presets > 
change length to metric
Angles: radians
Unit scale: 1 


Next, in our 3d viewport, the meters at the top left. this only means the grid space now understands metric units and tells us that the grid is measured in meters. 



Not that our cube is now exactly one metric meter 
It is clearly 2 metric meters


Next 
Select the cube  > open “n” properties tab in the 3d view port > shift + left click drag on top of the x,y,z > set scale from 0.5 to 1 



Next in 
Object > Apply > scale 



Notice scale is now set to ones.



Next 
Export as either obj or FBX from blender > remember to name your file 



Make sure only selected objects  and mesh is highlighted



Then hit export
Next 
Open up unity > game object > 3d object > cube



To preview a Unity cube 
Next 
Import our cube by right-clicking in the empty space inside assets folder



Import new asset 



Browse for the FBX file we just created 



import



Left click and drag the model into the scene to compare to the Unity cube